Thermo Scientific Alpha pH 1000 User manual

Alpha pH 1000
Controller/Transmitter
pH / ORP

ROSS and the COIL trade dress are trademarks of Thermo Fisher Scientific Inc. U.S. patent
6,793,787.
AQUAfast, Cahn, ionplus, KNIpHE, No Cal, ORION, perpHect, PerpHecT, PerpHecTion,
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PerpHecT meters are protected by U.S. patent 6,168,707. PerpHecT ROSS electrodes are
protected by U.S. patent 6,168,707. ORION Series A meters and 900A printer are protected
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Cal electrodes are protected by U.S. patent 7,276,142.© 2009 Thermo Fisher Scientific Inc.
All rights reserved. All trademarks are the property of Thermo Fisher Scientific Inc. and its
subsidiaries.The specifications, descriptions, drawings, ordering information and part
numbers within this document are subject to change without notice.This publication
supersedes all previous publications on this subject.

Preface
This manual serves to explain the use of the Alpha pH1000 pH/ORP process
controller/transmitter. The manual functions in two ways, firstly as a step by step guide to
help the user operate the instrument. Secondly, it serves as a handy reference guide. This
instruction manual is written to cover as many anticipated applications of the Alpha pH1000
pH/ORP process controller/transmitter. If you have doubts in the use of the instrument,
please do not hesitate to contact the nearest Authorized Distributor.
Thermo Scientific will not accept any responsibility for damage or malfunction of the unit due
to improper use of the instrument.
The information presented in this manual is subject to change without notice as
improvements are made, and does not represent a commitment on part of Thermo Scientific.
Copyright ©2009
All rights reserved

Safety Information
The Controller/ Transmitter shall be installed and operated only in the manner specified in this
Instruction manual. Only skilled, trained or authorized person should carry out installation, setup
and operation of the instrument.
Before powering up the unit, make sure that power source is connected to it as specified on the
top label. Failure to do so may result in permanent damage of the unit.
The unit has live and exposed parts inside. If it has to be opened, make sure that power to the
unit is off and disconnected.
The unit is Fuse protected. In the event the fuse has to be replaced, use only those as specified
in the manual.

TABLE OF CONTENTS
1 INTRODUCTION ___________________________________________________ 1
1.1 Description of Unit............................................................................................1
1.2 Applications......................................................................................................1
2 ASSEMBLY AND INSTALLATIONS ____________________________________ 2
2.1 Measurement and Control System...................................................................2
2.2 Unit Dimensions...............................................................................................2
3 ELECTRICAL CONNECTIONS ________________________________________ 3
3.1 Connection Diagram ........................................................................................3
3.2 Back Panel.......................................................................................................5
4 OVERVIEW _______________________________________________________ 6
4.1 Keypad and Display.........................................................................................6
4.2 Function Groups...............................................................................................7
4.3 Control Concept...............................................................................................8
5 MEASUREMENT ___________________________________________________ 9
5.1 Display in Measurement mode.........................................................................9
5.2 Security Codes.................................................................................................9
6 CALIBRATION____________________________________________________ 11
6.1 pH Calibration ................................................................................................11
6.2 ORP – mV Calibration....................................................................................12
6.3 ORP – % Calibration......................................................................................13
7 ADVANCED SET UP MODE _________________________________________ 14
7.1 Electrode Offset (OFS) sub-function..............................................................14
7.2 Setting temperature (Set oC) sub-function .....................................................14
7.3 Control Relay A/ Control Relay B (SP1/SP2) sub-function............................16
7.4 Controller (Cntr) sub-function.........................................................................18
7.5 Current Output (mg) sub-function ..................................................................20
7.6 Configuration (ConF) sub-function.................................................................21
7.7 Calibration (CAL) sub-function.......................................................................24
8 ADVANCED SET UP MODE ____________________ Error! Bookmark not defined.
8.1 Auto mode (mode after switch-on).................................................................25
8.2 Manual mode .................................................................................................25
9 TECHNICAL SPECIFICATIONS ______________________________________ 26
10 ACCESSORIES ___________________________________________________ 28
11 GENERAL INFORMATION __________________________________________ 29
11.1 Warranty.........................................................................................................29
11.2 Packaging ......................................................................................................29
11.3 Return of Goods.............................................................................................29
11.4 Guidelines for Returning Unit for Repair........................................................29
12 APPENDICES ____________________________________________________ 30
12.1 Appendix 1.....................................................................................................30
12.2 Appendix 2.....................................................................................................31
12.3 Appendix 3.....................................................................................................32
12.4 Appendix 4.....................................................................................................33

1
1 INTRODUCTION
1.1 Description of Unit
Thank you for purchasing the ¼ DIN Alpha pH1000 pH/ORP process controller/transmitter.
This unit is used for measuring either pH or ORP parameter one at a time, and the
operational mode is switchable from the menu. You can use this unit to measure pH or ORP
with limit control. This controller has many user-friendly and safety features which include:
•Menu-driven program that simplifies set-up
•Built-in non-volatile memory backup to ensure that calibration and other information
are not erased if power supply fails
•Press-button two-point calibration and electrode offset adjustment from the
keypad
•Automatic temperature compensation (ATC)
•Manual temperature compensation setting without the ATC probe, with independent
setting for calibration and process temperature
•0 to 2000 second time delay adjustment on all relays – minimise false alarms
•Separately adjustable high and low set point hysteresis (dead bands) prevent
chattering of relays around the set points
•Asymmetrical/symmetrical input for pH/ORP operation
•Three control modes: limit, proportional pulse length or proportional pulse frequency
•Large dual display LCD for easy reading with clear multiple annunciators, alarm
status, operational and error messages
•Two switching contacts as set-point triggering relays
•A third relay that can be be set up to perform either Alarm or Wash function
•When set to work as Alarm relay, alerts you when readings exceed set-point limits after
a set time buffer, and if the Pt100/Pt1000 wires are broken or disconnected during the
ATC function
•Programmable duration and frequency in the Wash mode
•Hold function freezes output current (0/4…20mA) and releases control relays
•LED indicators signal control activities to monitor controller status from a distance
•Protection against electromagnetic interference – galvanically isolated 0/4…20mA
output provides safety for datalogging and control purposes
•Choice of 7 buffers from USA or NIST standards
1.2 Applications
Use this controller in panel mounted enclosures for applications such as water treatment and
monitoring, galvanic-decontamination, chemical processing food processing, clean or waste
water control and neutralisation process.

2 ASSEMBLY AND INSTALLATIONS
2.1 Measurement and Control System
A typical measurement system consists of:
•a pH/ORP process controller
•a pH/ORP combination electrode with integrated or separate temperature sensor Pt
100/1000,
•an immersion, flow or process assembly with or without a potential matching pin (PMP)
•a final control element such as pump or valve
•a recorder
•an appropriate pH or ORP measurement cable
PH Controller
Flow Assembly
Measurement Cable
Process Assembly
with Electrode Power Mains
(220/110 VAC)
Chart Recorder
2.2 Unit Dimensions
max. 175 max. 45
Mounting Cut-Out
Flat Ga
(To be Insert
Note: The Taped Cor
sket (1mm)
ed By Customer)
ners Have to Be On Top
92
32
56
9
6
92 + 0.5
92 + 0.5
The field-tested control panel housing is 96 x 96 mm; with protection class IP 54 (front).
2

3 ELECTRICAL CONNECTIONS
3.1 Connection Diagram
ENSURE electrical mains is disconnected before proceeding.
Signal OutputInputHold
Alarm
Relay B
Relay A
Power Mains
3
pH
mA
PEAC: NL
1
2
5
4
3678 9 10 11 12 13
*
)
indicated contact positions are for currentless con
Pt 100
Potential Matching Pin (PMP) Signal Input pH/O
-
+
PE/S
14 15 17
15 16
ditions
RP
S/
V
PE/S
pH
18 19 20 21 22
S/S/
BNC

Measuring Cable
pH Combination
Electrode
Temp. pH
BNC
0 / PA
PE NLS
22 21
1
2
320 19 18
Potential
Matching Pin (PMP)
s
Symmetrical high-impedance
connections
Te
0 / PA
PE NLS
22 21
1
2
320
4
Asymmetrical connections
Measuring Cable
pH Combination
Electrode
mp. pH
BNC
19 18
Potential
Matching Pin (PMP)

3.2 Back Panel
ENSURE electrical mains is disconnected before proceeding.
The back panel consists of two connectors. The first connector is the 17-way PCB edge
connector and the other is the 5-way connector.
Connection for the 17-way screw terminals (from left to right):
1. AC mains live wire 10. Alarm/Wash relay working position (NO)
2. AC mains neutral wire 11. Alarm/Wash relay common
3. AC mains protective earth wire 12. Alarm/Wash relay resting position (NC)
4. Low set relay resting position (NC) 13. Hold function switch terminal 1
5. Low set relay common 14. Hold function switch terminal 2
6. Low set relay working position (NO) 15. No connection
7. High set relay resting position (NC) 16. 4 - 20 mA for -ve connection
8. High set relay common 17. 4 - 20 mA for +ve connection
9. High set relay working position (NO)
Connections for the 5-way screw terminals:
18. Pt100/Pt1000 lead 1 terminal
19. Pt100/Pt1000 sense lead terminal
20. Pt100/Pt1000 lead 2 terminal
Note: If using a two-wire RTD, short terminal 19 to terminal 18.
Pt 100/Pt 1000 is selectable via an internal jumper. Factory default is Pt100. See Appendix
1 for directions on switching the RTD type.
21. pH/ORP (potential matching pin)
22. pH/ORP (shield)
Pt100/ 0V/
PAL
pH/mV
S/
RELAYA
L N PE
100mA (F)
FUSE 250VAC
5
HOLD
ALARM / WASH
YBRELA
Pt1000
NC
-
+
Important: The Alarm relay functions as an “Active Low” device i.e. it switches OFF under
Alarm condition. Therefore, the Alarm display device should be connected to the ‘NC’
contacts of the relay (11 and 12). In the Wash mode, the relay works on a positive mode.
Therefore, the Wash device should be connected to contacts 10 and 11.

4 OVERVIEW
4.1 Keypad and Display
4.1.1 Keypad
•Perform rapid 2-point calibration
•Allows entry to Set up mode
•Select individual functions within the function group of Set up mode
•Store input data in the Set up mode
•Start calibration in the calibration mode
•Select various function groups in the Set up mode.
•Set parameters and numerical values in sub functions of Set up mode
If pressed continuously, the setting speed increases
•Return to the Measurement mode when both keys are pressed together
•Return to the Measurement mode when both keys are pressed together
•Switch beween AUTO and MANUAL relay operation mode
•Display limit set-point values for the switch contacts in AUTO relay operation
mode
•Switch between RELAY A and RELAY B in MANUAL relay operation mode
4.1.2 Display
The LCD display features two numerical displays that show status messages and measured
values for easy, quick reference. The display provides short-text information for setting
parameters and configuration.
7.00
25.0
MEAS CALSETUP
READY
HOLD
ERR
pH
•READY: Comes on after a successful calibration
°C
ATC
•ATC: Comes on in the ATC mode. Disappears in the
Manual temperature Compensation mode.
CON
•CAL: Calibration mode of pH/ORP and temperature
•MEAS: Measurement mode
•SETUP: Set-up mode of function groups
•HOLD: Relay position and current output are frozen
•“ATC” flashes if the temperature probe is faulty in its ATC
mode
•ERR: Error or alarm indicator
•Display for RELAY A/B. Green LED indicates measured value within limit
while RED LED indicates measured value outside limit.
•Alarm display if limit value overshoot or the ATC probe fails;with ERR
annunciator appears on the display. Wash display if cleaning cycle is on.
6

4.2 Function Groups
The main function and sub-function groups are organised in a matrix format for configuration and
selection of parameters. The main function groups are:
1) Offset adjustment (OFS)
2) Temperature Measurement / compensation settings (Set oC)
3) Control relay 1 configuration (SP1)
4) Control relay 2 configuration (SP2)
5) Control type (Cntr)
6) Current output (mg)
7) Configuration (ConF)
8) Calibration (CAL pH)
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
Sp1
HOLD
SETUP
Sp2
HOLD
SETUP
° C
HOLD
SETUP
Cal
HOLD
SETUP
HOLD
SETUP
C
OFS
The set-up parameters can be viewed or changed by entering a security code. See section 5.2
for security code information.
4.2.1 How to view operating parameters without access to change them:
a) Press the Enter key. The display will prompt the user to
enter a security code (S.Cd). Leave the security code at
“000” (do not enter a security code).
SETUP
HOLD 000
S.Cd b) Press ENTER key again. This allows you to only view (not
change) any sub-functions’ settings.
c) Press the ▲or ▼key to scroll through the sub-functions.
d) Press the ENTER key at a particular sub-function to view in detail.
e) Press the ENTER key to return to the sub-function menu.
f) Press the ▲or ▼keys simultaneously (as an Escape key) at any time to return to the
Measurement mode.
Note: To simplify operations, the controller will not display parameters that are not relevant to a
particular subfunction. For example, if the user set the controller for limit control, it will not display
pulse length/frequency settings.
7

4.3 Control Concept
The main function and sub-function groups are organised in a matrix format as shown below.
These functions can be accessed via the front keypad for configuration and selection of
parameters.
MEASURE
OFFSET
SET C
O
SET-POINT 2
SET-POINT 1
Set value 1
Switch On/Off ATC
Set Offset
Process temp.
(MTC)
MIN / MAX Function
Set value 2 Hysteresis 2
Calib. temp.
(MTC) Calibrate Pt100
Pick-up delay
contact 1
MIN / MAX Function
Hysteresis 1
Pick-up delay
contact 2 Dropout delay
contact 2
Dropout delay
contact 1
CONFIGURATION
CALIBRATION
Calibrate
1st value Display zero point
and slope
Calibrate
2nd value
MEASUREMENT
RANGE
CONTROLLER
Controller type N.O. / N.C.
Contact
Current output
0.20 / 4.0 mA
Cycle time bzw
Max. Frequency
pH / ORP
at 0/4 mA
Proportional
range XP .
pH/ ORP Symm.
/ Asymmetrical Alarm delay
Alr Alarm contact
cont./wiper cont Reset to factory
default settings
Electrode type
Glass/Antimony
act
Cln 1000
Dur
CODE
The controller offers two levels of password protection: (1) for direct access to calibration
function and (2) for setting or editing specific controller parameters or functions in the SETUP
mode to suit individual requirements.
Note: The passwords are not user-defined and have been set by factory. It is very important to
keep these passwords strictly confidential to avoid unauthorised tampering of the system at
all times.
Note: If the user reads parameters only, the controller automatically reverts to Measurement mode
if no key is pressed for 30 seconds.
8

9
5 MEASUREMENT
5.1 Display in Measurement mode
When the controller is initially powered on, it automatically enters into the Measurement mode
after the large dual LCD displays all segments briefly.
The upper display shows the measured pH or ORP value, while lower display shows either
temperature value if controller is set for pH measurement or “OrP” if it is set for ORP
measurement.
Annunciators at right side of display indicate whether controller is set for pH or mV
measurement. If the controller is set for ORP % measurement, neither the pH or mV indicator
displays.
Similarly annunciators or icons at top or left side of display show current status of controller, e.g.
“MEAS”, “SETUP”, “CAL”, “READY”, etc. In addition, error messages also guide user in time of
any faulty conditions as indicated by “ERR” or icons flashing.
5.1.1 Check electrode performance
To read current electrode slope and offset values without changing them:
1) Press the CAL key followed by the ENTER key without adjusting the security code (leave
code at “000”). The upper display shows electrode slope. The lower display reading shows
the pH reading at 0 mV.
Note: If security code is changed to a value other than “000”, press the ENTER key to return to
Measurement mode, without displaying electrode information.
2) Press the ENTER key a second time to return to Measurement mode.
5.1.2 Checking set points
To read current set point values without changing them:
1) Press the RELAY Selection (Rel A/Rel B) key. The upper display shows the set point for
Relay A; the lower display shows “SP1”.
2) After two seconds the upper display shows the set-point value for Relay B; the lower display
shows “SP2”.
3) After an additional two seconds, the controller returns to its Measurement mode.
5.2 Security Codes
This controller has two levels of security protection with separate security codes. The first level
allows entry into the Calibration mode: security code = 11; the second allows entry into the
SETUP mode: security code = 22.
The security codes protect the controller from unauthorised tampering of its current setting. The
parameters cannot be changed unless the security code is entered.

5.2.1 How to enter and change parameters in Calibration mode
1) Press the CAL key. The upper display shows “000” and the
lower display shows “C.Cd” to prompt the user to enter the
Calibration security code.
10
2) Press the ▲or ▼key to scroll upper display to Calibration
security code “11”.
3) Press the ENTER key. If configured for pH control, the
display shows “CAL pH”. If configured for ORP control, the
display shows “CAL OrP”.
00
SETUP
HOLD
0
4) Press ENTER key again to begin calibration. Refer to Section 6 for full details on calibration.
5) Press the ▲and ▼keys simultaneously (escape) to return to the Measurement mode.
NOTE: To view (not change) the SETUP parameters, press the ENTER key when the security
code reads “000”.
5.2.1.1 Clearing the Calibration security code from the display
The calibration security code automatically resets from “11” to “000” after you return to
Measurement mode, so you do not need to clear the security code from the display.
5.2.2 How to enter and change parameters in Advanced Setup mode
1) Press the ENTER key once. The upper display shows “000” and the lower display shows
“S.Cd” to prompt you to enter the Advanced Setup security code.
2) Press the ▲or ▼key to scroll the display to Setup security code “22”.
3) Press the ENTER key.
4) If configured for pH control, the upper display reads “OFS”.
5) If configured for ORP control, the upper display reads “SP1”.
NOTE: Pressing the ENTER key at a value other than “22” causes the controller to revert to the
Measurement mode.
6) You are now in the Advanced Setup mode. See Section 7 for complete instructions. To
return to Measurement mode, press the ▲and ▼keys simultaneously (escape).
NOTE: If you want to view (not change) set up parameters, press the ENTER key when the
security code reads “000”.
5.2.2.1 Clearing the Advanced Setup security code from the display
After you have entered the security code and returned to the Measurement mode, the security
code “22” still appears on the display whenever you press the ENTER key. To conceal the
security code, you must manually reset the code. To clear the Advanced Setup security code
from the display:
1) Press the ENTER key in the Measurement mode.
2) Set to any security code (not 11 or 22) and complete by pressing ENTER.
NOTE: When you enter the Calibration mode with code “11” or Advanced Setup mode with
security code “22”, the unit automatically enters into the HOLD mode until you return back to
Measurement mode. The HOLD annunciator is displayed at the upper left of the display. While on
HOLD, the current output is frozen and set point relays are deactivated.

6 CALIBRATION
You can reach the Calibration mode directly from the Measurement mode by pressing the CAL
key and entering the Calibration security code. You can also reach the Calibration mode from
the Advanced Setup mode.
6.1 pH Calibration
This unit features 7 preset buffer values (1.01, 4.01, 6.86, 7.00, 9.00, 9.18 and 10.01) for
fast auto calibration. When you calibrate this instrument, you need a standard pH buffer
solution that matches one of these values.
1) Enter Calibration mode. While in the Measurement
mode, press the CAL key and scroll to Calibration code
“11”. Press the ENTER key again. The upper and lower
display reads “CAL pH”.
NOTE: If the display reads “CAL OrP”, see section 7.6.2 for
procedures on how to switch from ORP to pH readings.
11
HOLD
6.96
7.00
4.02
4.00
SETUP
HOLD
CAL
59.0 mV
7.00
pH
READY
HOLD
CAL
CAL
pH
SETUP
HOLD
2) Press the ENTER key again to begin calibration. The
“CAL” indicator appears at the top of display and the
buffer indicator appears in the bottom left corner of the
display. The upper display shows your present
uncalibrated reading. The lower display indicates one of
the two buffer values used for the first point calibration.
It would either be 7.00 or 6.86.
pH
pH
pH
3) Press the ▲or ▼key to scroll the lower display to the
buffer value that matches your buffer solution.
4) Make sure the electrode is in the buffer solution. In
ATC, you must also immerse the temperature probe in
the buffer solution. Likewise for symmetrical mode, you
must also immerse the potential matching pin in the
buffer.
pH
5) Press the ENTER key to confirm the buffer value and
start the calibration of its first point. The electrode
indicator and CAL indicator both flash. The controller
automatically adjusts the reading to match the buffer
value.
6) The lower display will now show its next lower ‘pH’
buffer. Use ▲and ▼keys to select its second buffer
from one of the 5 preset values. Remove the electrode
from the first buffer, wash and then immerse into the
second buffer. Once the upper display stabilises press
the ENTER key, the electrode and CAL indicator will flash. The controller adjusts the
reading to the buffer.
7) After calibrating to a second buffer value, this controller will automatically display slope in the
upper display and zero point in the lower display. You can view the values for zero point and
slope without calibration --- see section 5.1.2 for instruction The zero point and slope are re-
determined after each calibration.

8) Press the ENTER key. If you entered the calibration mode using the CAL key, the
controller will return to the Measurement mode. If you entered the calibration mode from the
Advanced Set-up mode, the controller will return to the sub-function menu.
Note: If there is a calibration error, the controller displays “ERR”. If this happens, press both the ▲
and ▼keys (escape) to restart the calibration beginning from step 1.
Note: When calibrating with manual temperature compensation, the controller automatically
changes from the preset process temperature to the calibration temperature. After leaving the
Calibration mode, the controller switches back to process temperature (for setting the calibration
temperature and the process temperature, see section 7.2.3).
6.2 ORP – mV Calibration
This mode allows one-point calibration.
1) Enter Calibration mode. While in the
Measurement mode, press the CAL key and
scroll to Calibration code “11”. Press the
ENTER key again. The upper and lower display
reads “CAL OrP”.
NOTE: If the display reads “CAL pH”, see section
7.6.2 for procedures on how to switch from pH to
ORP mV readings.
12
CAL
P
D
SETU
HOL
226
P
D
SETU
HOL
2) Place sensor in the ORP solution.
3) Press the ENTER key to begin calibration. The
“CAL” indicator appears on the display. The
upper display shows the current mV output of
the electrode without any offset adjustment.
4) Press the ▲and ▼keys to match the mV
value to your exact reading.
C
5) To confirm, press the ENTER key.The
controller calculates the correction factor and
returns to the Measurement mode.

6.3 ORP – % Calibration
The ORP % mode allows you to calibrate at two points: a low concentration sample (20%) and a
high concentration sample (80%). To calibrate the controller for ORP %:
13
CAL
SETUP
HOLD
1) Enter Calibration mode. While in the Measurement
mode, press the CAL key and scroll to Calibration
code “11”. Press the ENTER key again. The upper
and lower display reads “CAL OrP”.
NOTE: If the display reads “CAL pH”, see section 7.6.2
for procedures on how to switch from pH to ORP mV
readings.
2) Press the ENTER key to begin calibration. The
“CAL” indicator appears on the display. The upper
display shows “80”. The lower display shows “C1”
(=calibrated value 80%).
3) Place sensor in the high concentration sample
(relative value of 80%).
4) Press the ENTER key to confirm the value. The
electrode indicator and CAL indicator flash. The unit
automatically adjusts its reading to match the
solution value.
5) The display will now show ‘20’ and ‘C2’. Remove the
electrode from the first standard, wash it well and
then immerse it in the 20% standard. When the
display stabilises, press the ENTER key. The ‘CAL’
indicator flashes and the controller adjusts its display to the 20% relative value and exits to
Measurement mode.
Note: If there is a calibration error, the controller displays “ERR”, and it will not automatically return
to Measurement mode. If this happens, press the ▲and ▼keys simultaneously (escape) to
restart the calibration beginning from step 1.
Note: If you stop calibration after entering the first value, or if calibration is defective, the controller
will use its original calibration data.
80
SETUP
HOLD
C.1
20
SETUP
HOLD
C.2

7 ADVANCED SET UP MODE
7.1 Electrode Offset (OFS) sub-function
You can perform electrode offset only in the pH mode. This mode allows you to change the
offset parameter to make reading corrections without removing the electrode from the control
system. You can make adjustments of up to ±120 mV.
The controller will add or subtract the value from the measured pH and display the correct value.
However, if you need to offset the value beyond the average offset you would expect in your
application type, consider a full calibration or even electrode replacement.
1) Pull a sample from the system. Record the controller’s pH reading at the time you take the
sample.
2) Measure the pH of your sample using a calibrated pH tester, hand-held meter, or bench
meter. Record the correct pH value.
3) Enter Advanced set-up mode. Press the ENTER key and scroll to Advanced Set-up
security code “22”. Press the ENTER key again.
4) Press the ▲or ▼key to scroll until the upper display shows OFS.
5) Press the ENTER key. The SETUP annunciator appears at the top of the display. The lower
display shows the current measured pH value. The upper display shows the current offset
value.
6) Press the ▲or ▼key until the pH value coincides with the correct pH value noted in Step
2. As the ▲and ▼keys are pressed to adjust the pH value, you will see that the ‘offset’
value in its upper display also changes.
7) Press the ENTER key to enter the offset value.
Note: The offset value is reset during full calibration. See Section 6 for full calibration instructions.
Note: The offset parameter is blanked out during ORP operation.
7.2 Setting temperature (Set °C) sub-function
7.2.1 Selecting automatic or manual temperature compensation
Set
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
1) Enter Advanced Set-up mode. Press the ENTER key and scroll
to Advance Set-up security code “22”. Press the ENTER key
again.
2) Press ▲and ▼keys to scroll until display shows “Set °C”.
3) Press ENTER key. The lower display shows “Atc”; upper display
shows “on” or “oFF” depending on whether or not ATC is selected.
4) Press ▲and ▼keys to toggle between ATC on and off.
5) Proceed with additional Advanced Set-up procedures (press
ENTER again) or return to Measurement mode by pressing ▲and
▼keys (escape) simultaneously.
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7.2.2 Temperature calibration (ATC mode only)
1) Select “ATC on” as described above in Section 7.2.1.
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2) Press ENTER key. The upper display indicates current
temperature offset. The current measured temperature is
shown in the lower display.
3) Compare the current measured temperature on the controller
display to a thermometer known to be accurate. Note down
the correct temperature value.
4) Press ▲and ▼keys to scroll the lower display to match the
correct value. Upper display will now show the offset value.
You can offset temperature up to ±5 °C.
5) Press ENTER key to confirm your selection.
6) Continue with additional Advanced Set-up procedures, or
return to the Measurement mode by pressing ▲and ▼keys
(escape) simultaneously.
7.2.3 Setting manual temperature compensation
Note: This option is not available when the controller is set for
ATC operation.
For manual temperature compensation, two different
temperatures: process and calibration, can be input
independently. This allows calibration at a temperature other than
the process temperature. Example: setting a calibration
temperature of 25oC allows calibration using standard buffer
solutions at 25oC, even if the process temperature is different.
1) Select “ATC oFF” as described above in section 7.2.1
2) Press ENTER key. Upper display shows current process
temperature and lower display shows “P.°C” to indicate
process temperature.
3) Press ▲and ▼keys to adjust the process temperature
value, between -9.9 and 125°C.
4) After setting the process temperature value, press ENTER
key. Upper display shows current calibration temperature and
lower display shows “C.°C”.
5) Press ▲and ▼keys to adjust the calibration temperature value, between -9.9 and 125°C.
6) Press ENTER key to confirm.
7) Continue with additional Advanced Set-up procedures, or return to Measurement mode by
pressing ▲and ▼(escape) simultaneously.
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25.0
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ATC
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25.0
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25.0
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